US6833206B2 - Auxiliary power supply for a vehicle with a combustion engine and method for operating same - Google Patents
Auxiliary power supply for a vehicle with a combustion engine and method for operating same Download PDFInfo
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- US6833206B2 US6833206B2 US09/964,840 US96484001A US6833206B2 US 6833206 B2 US6833206 B2 US 6833206B2 US 96484001 A US96484001 A US 96484001A US 6833206 B2 US6833206 B2 US 6833206B2
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- electrolyzer
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- fuel cell
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
- H01M8/04164—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal by condensers, gas-liquid separators or filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M16/00—Structural combinations of different types of electrochemical generators
- H01M16/003—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers
- H01M16/006—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers of fuel cells with rechargeable batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
- H01M8/0656—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/186—Regeneration by electrochemical means by electrolytic decomposition of the electrolytic solution or the formed water product
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04925—Power, energy, capacity or load
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04925—Power, energy, capacity or load
- H01M8/04947—Power, energy, capacity or load of auxiliary devices, e.g. batteries, capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Definitions
- the invention relates to an auxiliary power supply for a vehicle with a combustion engine, and to a method for operating the same.
- Fuel cell vehicles have the ability to produce electric power during stand-still of the vehicle, without causing considerable pollution or noise compared to vehicles with a combustion engine.
- U.S. Pat. No. 4,657,829 A1 discloses a fuel cell car with a fuel cell vehicular power plant. Fuel for the fuel cell stack is supplied by a hydrocarbon catalytic cracking reactor and CO shift reactor. A water electrolysis subsystem is associated with the stack. During low power operation, part of the fuel cell power is used to electrolyze water with hydrogen and oxygen electrolysis products being stored in pressure vessels.
- One object of the invention is to provide an electric power supply for a vehicle with a combustion engine, which can supply power even at stand-still of the combustion engine.
- Another object of the invention is to provide a vehicle power supply that reduces pollution and noise.
- Still another object of the invention is to provide a method for operating such a power supply.
- the fuel cell system operates at least indirectly on vehicle based fuels. That is, vehicle produced electric power is used to electrolyze water while the vehicle 1 is operative, and this hydrogen is then used when the vehicle 1 is inoperative to generate electric power via a fuel cell.
- FIG. 1 is a schematic depiction of a first preferred embodiment of a vehicle with a combustion engine and a fuel cell system according to the invention.
- FIG. 2 shows a detail of the power supply unit in a vehicle.
- the invention can be used advantageously in motor vehicles where a fuel cell system supplies electric energy for low power requirements. Also, the invention can be used to great advantage in trucks or buses, premium segment cars or other vehicles which need considerable amounts of electric power even when their combustion engine is not running. Preferably the invention is used in combination with an internal combustion engine as combustion engine of the vehicle.
- FIG. 1 shows schematically a vehicle 1 with a combustion engine 2 .
- the vehicle 1 has wheels 4 . 1 - 4 . 4 with at least two driveable wheels 4 . 1 , 4 . 2 connected to a drive shaft 3 as is known in the art.
- the vehicle 1 may also be equipped with more than one driveable axle.
- the power train of the vehicle is shown only schematically.
- the vehicle 1 is also equipped with a conventional alternator 6 , an electric storage device 7 (e.g., a battery), and various low power electric loads 5 .
- Alternator 6 can also be a starter/generator device which, when used as a motor, can start the engine and which, when used as a generator, is mechanically driven by the engine thus producing electric energy which can be stored in an electric storage means such as a battery or the like.
- Alternator 6 produces electric power while the combustion engine 2 is operative.
- the electric storage device 7 is used for starting the engine and/or can be used to store electric power produced by the alternator 6 , as is known in the art.
- the various electric loads 5 are preferably low power electric equipment usually present onboard a vehicle, such as lighting, electric auxiliary drives, water pumps, air conditioning, radio, coffee maker, microwave oven, refrigerator, telecommunication devices and so on.
- the vehicle is also equipped with an auxiliary power unit (APU) 8 which delivers electric power when the combustion engine is not running.
- APU 8 comprises a fuel cell 10 and an electrolyzer 9 for delivering hydrogen and/or oxygen to the fuel cell 10 .
- the electrolyzer 9 comprises a hydrogen storage tank, and can also comprise an oxygen storage tank.
- the APU 8 is described in more detail in FIG. 2, in which reference number 1 . 1 designates the regular part of the vehicle 1 without the APU 8 (i.e., with the combustion engine 2 and alternator 6 , electric storage device 7 , power train and so on).
- the APU 8 includes a hydrogen storage unit 15 , a device 11 for recovering water from the fuel cell exhaust, a water tank 12 for storing water. Also, dc/dc-converters and/or dc/ac-converters, and electric control means are included for distributing the electric power of the fuel cell 10 to electric loads 5 . Additionally, an oxygen storage means can be included in order to store the oxygen produced by the electrolyzer 9 .
- the fuel cell 10 is composed of one or more stacks of single fuel cells, as known in the art, and is thus capable of delivering enough electric power as needed in the APU 8 .
- the electric power of the auxiliary power unit 8 is well below the electric power needed for a traction system in a vehicle 1 .
- the fuel cell 10 is a reversible fuel cell which is capable of fuel cell and electrolyzer operation.
- the reversible fuel cell 10 itself can oxidize hydrogen to water when operating as a fuel cell, and decompose water to hydrogen and oxygen when operating as an electrolyzer. In this embodiment, therefore, the fuel cell 10 and the electrolyzer 9 are replaced by a single reversible fuel cell unit.
- electric power from the vehicle based alternator 6 is used to produce hydrogen as fuel for the fuel cell system 10 while the combustion engine 2 is operative.
- the electric power of the alternator 6 powers the electrolyzer 9 , which is preferably a high pressure electrolyzer with a working pressure above 100 bar (e.g., 140 bar).
- the hydrogen is favorably stored in the hydrogen tank 15 , which is preferably a high pressure tank being capable of storing hydrogen at a pressure above 300 bar, e.g. 400 bar. If enough space is available, for example in a truck, a bigger hydrogen storage may be acceptable, storing hydrogen just at the electrolyzer's operating pressure (the electrolyzer pressure is sufficient for pressurizing the hydrogen).
- the hydrogen is consumed in the fuel cell 10 and electric power is delivered by the fuel cell 10 to the vehicle 1 .
- Hydrogen is produced by the electrolyzer 9 which is powered by the alternator 6 , by decomposing water.
- the water is fed from water supply means, e.g. a water supply tank 18 , and/or from a water buffer tank 13 which is fed from the water carried in the fuel cell exhaust.
- the electrolyzer 9 can be operated directly with the dc-voltage available at the vehicle's generator/battery terminals, or while the vehicle is cruising.
- the electrolyzer 9 favorably is operated at elevated pressure, with the hydrogen generated being stored in a pressure tank 15 which can also be used as the electrolyzer's housing.
- the fuel cell 10 is operated with the hydrogen from the storage tank 15 and ambient air providing auxiliary power silently and cleanly for example, air conditioning purposes. Additionally oxygen from the electrolyzer 9 can be stored on board and fed in the air stream to the fuel cell 10 (indicated by the dotted arrow) to improve the performance of the system such as power density, efficiency and the like.
- the fuel cell 10 is cooled either by air, or by using part of the regular coolant loop of the vehicle 1 .
- the water for the electrolyzer 9 can be from the fuel cell's exhaust, which however might not cover the entire water demand, and/or by a condenser in the vehicle engine's exhaust while the vehicle 1 is cruising, purified appropriately and stored in a small water tank 18 . Only a relatively small percentage of the steam contained in the engine's exhaust needs to be condensed to cover the water demand of the electrolyzer 9 .
- the fuel cell exhaust is fed into a condenser 11 , where water carried therein is separated.
- the gaseous exhaust is then discharged to the ambient atmosphere.
- Water collected in the manner is fed into the water buffer tank 13 via a purification unit 12 arranged upstream the water buffer tank 13 in order to avoid pollution of the water fed into the electrolyzer 9 .
- Water from the water tank 18 can be added upstream or downstream of the water buffer tank 13 or into the water buffer tank 13 in addition to the amount of water recycled from the fuel cell exhaust.
- a pressure pump 14 is arranged between the water buffer tank 13 and the electrolyzer 9 in order to pressurize the electrolyzer 9 via pressurizing of liquid water and thus generate hydrogen at the elevated pressure of the electrolyzer without any need to compress this gas. It is energetically favorable to arrange the pump 14 so that the liquid can be used as pressure mediating medium.
- a gas-liquid separator 16 is arranged for keeping the water in the electrolyzer 9 and avoiding water droplets' being fed into the hydrogen storage 15 .
- a compressor 17 can be arranged between the electrolyzer 9 and the hydrogen storage 15 to adjust the pressure levels of the media kept in the electrolyzer 9 and the hydrogen storage 15 . Additionally, the storage 15 can be reduced in volume by compressing the hydrogen.
- Oxygen necessary for the operation of the fuel cell 10 can be produced by the electrolyzer 9 via an optional oxygen storage (not shown) and/or by feeding air into the fuel cell.
- Especially polymer electrolyte membrane fuel cells can be run on air as oxidant.
- the air or the oxygen is fed via a compressor or blower at the pressure level required for the fuel cell operation. If the fuel cell 10 is run under more or less ambient pressure conditions, the compressor can be replaced by a blower. Further, if the oxidant for the fuel cell is air, additional oxygen produced by the electrolyzer 9 can be fed to the fuel cell cathode to boost the fuel cell 10 . This is indicated by the dotted line between electrolyzer 9 and the fuel cell 10 in the figure.
- the combination of electric power consuming electrolysis with producing electric power by the fuel cell is not a very efficient method of generating electric power
- the overall efficiency of the vehicle 1 for low power requirements is enhanced by this combination according to the invention.
- Environmental pollution is reduced.
- the fuel cell system when the engine is not running, for example when the vehicle (e.g., a truck) stops overnight, vehicular noise is reduced substantially and comfort for passengers is increased. This cannot be achieved with batteries as storage means for electric power, because they are too heavy and their cyclability is not sufficient.
- vehicle produced electric power is used to electrolyze water while the vehicle 1 is operative, and this hydrogen is then used when the vehicle 1 is inoperative to generate electric power via a fuel cell.
- an electrolyzer 9 in the ways described above eliminates the need for an expensive and complex fuel processing system, and allows the fuel cell system 10 to operate at least indirectly on the same fuel as the vehicle's internal combustion engine 2 .
- an APU 8 is used in a truck. It is assumed that a continuous net power of about 2 kW is sufficient to cover the power demand of the truck's cabin during parking hours. If the peak power demand is larger for a short time, the truck's battery 7 can be used to boost the fuel cell 10 running at peak power in addition.
- a preferred fuel cell 10 delivers a current density of about 1 A/cm 2 at a voltage of 0.65 V corresponding to a power density of 0.65 W/cm 2 . Thus a total of about 3100 cm 2 of active cell area is needed.
- On board power supplies of trucks operate at a voltage level of 12 V; and thus about 19 single cells should be stacked together to form the fuel cell 10 , yielding about 12 V output voltage with 19 ⁇ 0.65 V.
- the factor 0.5 reflects the efficiency of a state of the art fuel cell of 50%. Its weight can be estimated to be a little more than 2 kg. The numbers for differing power demands can be derived easily in a similar way.
- the electrolyzer 9 For the electrolyzer 9 a maximum of 10 hours of the 2 kW power demand mentioned above is assumed. Further assuming an efficiency of the fuel cell 10 of about 50% according to the state of the art, the hydrogen demand is about 13 Nm 3 . Assuming 10 hours of operation for the electrolyzer 9 as well its capacity results to be 1.3 Nm 3 /h. With advanced state of the art high pressure electrolyzer technology operating well above 100 bar, (preferably around 140 bar), and a current density of 1.6 A/cm 2 at a voltage of about 12 V; six cells with an active area of 335 cM 2 are needed. The weight and volume of this 12 V electrolyzer stack unit are estimated to be in the same order of magnitude of slightly higher, respectively, as for the fuel cell 10 .
- the hydrogen storage tank 15 must be capable of storing about 13 Nm 3 hydrogen for a power demand of 2 kW. For compressed hydrogen at about 140 bar as operating pressure of the electrolyzer 9 , this results in a volume demand of about 100 liters, which in turn corresponds to a cylinder of 80 cm height and about 40 cm in diameter. This size is comparable to the size of the regular pressurized air tanks for the truck's brakes. Applying a higher operating pressure results in a corresponding reduction of volume.
- a pressure control system to feed the ambient pressure fuel cell 10 from the high pressure hydrogen tank 15 , gas/liquid separators 16 as part of the electrolyzer 9 , a water pump 14 yielding high pressure to feed the electrolyzer 9 , dc/dc-converters and/or ac/dc-converters, controllers, sensors and so on.
- a preferred system such as the one described above features about 25 l/kW if compressed hydrogen at 140 bar is used to store the hydrogen. This value can be reduced to 10 l/kW if the operating pressure is increased to about 400 bar. Other methods for storing hydrogen can be used alternatively.
- fuel cell 10 and electrolyzer 9 can be operated at higher or lower voltages resulting in significantly better overall system efficiency without sacrificing the volume which is mainly determined by the hydrogen storage.
- Electrolyzer hardware is well developed, reliable and cheap. With rather small volumes of water significant amounts of hydrogen can be produced. For example, 1 liter of water yields about 1200 Nl of hydrogen equivalent to 3.6 kWh of energy content (lower heating value).
- a fuel cell 10 used in the power supply according to the invention is composed of fuel cell stacks without external humidification needs.
- the power supply needs no external fuelling, i.e. is independent of whatever fuel the vehicle 1 is running on and is of compact and simple system design. No fuel processor is needed.
- the system shows high dynamics features with an extremely short start-up time since no bulky system components have to be heated up as compared to regular fuel cell systems with a reformer for reforming hydrocarbons or alcohol or the like.
- the system exhibits virtual freeze compatibility since waste heat to prevent freezing is available at all times.
- the components used are more or less state of the art components and the power supply shows virtually no limit of cycle numbers.
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Abstract
Description
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Priority Applications (1)
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US09/964,840 US6833206B2 (en) | 2001-09-28 | 2001-09-28 | Auxiliary power supply for a vehicle with a combustion engine and method for operating same |
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US09/964,840 US6833206B2 (en) | 2001-09-28 | 2001-09-28 | Auxiliary power supply for a vehicle with a combustion engine and method for operating same |
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Cited By (27)
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US20040028965A1 (en) * | 2002-08-07 | 2004-02-12 | Plug Power Inc. | Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system |
US20040028966A1 (en) * | 2002-04-17 | 2004-02-12 | Hibbs Bart D. | Energy storage system |
US20040028960A1 (en) * | 2002-08-07 | 2004-02-12 | Plug Power Inc. | Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system |
US20040028979A1 (en) * | 2002-08-07 | 2004-02-12 | Plug Power Inc. | Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system |
US20040072040A1 (en) * | 2002-04-23 | 2004-04-15 | University Of Massachusetts Lowell | Electrolyzer pressure equalization system |
US20040209128A1 (en) * | 2003-01-20 | 2004-10-21 | Karl-Ernst Noreikat | Method of operating a fuel cell system |
US20050106442A1 (en) * | 2003-10-09 | 2005-05-19 | Ulrich Gottwick | Vehicle with a combustion arrangement and a fuel cell device |
US20050129993A1 (en) * | 2003-12-16 | 2005-06-16 | Eisler Elwood A. | Purging anode channels of a fuel cell stack |
US20070128478A1 (en) * | 2005-12-06 | 2007-06-07 | Ballantine Arne W | High efficiency fuel cell system |
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US20070141408A1 (en) * | 2005-12-19 | 2007-06-21 | Jones Daniel O | Supplying and recirculating fuel in a fuel cell system |
US20070169723A1 (en) * | 2005-05-16 | 2007-07-26 | Keith Rutledge | Energy Conversion System For Hydrogen Generation And Uses Thereof |
US20080205086A1 (en) * | 2007-02-22 | 2008-08-28 | Lear Corporation | Inverter system |
US20080299432A1 (en) * | 2005-09-08 | 2008-12-04 | Airbus Deutschland Gmbh | Fuel Cell System for the Supply of Drinking Water and Oxygen |
WO2008154721A1 (en) * | 2007-06-19 | 2008-12-24 | Romaniuk Peter J | Hydrogen and oxygen gases, produced on-demand by electrolysis, as a partial hybrid fuel source for internal combustion engines |
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US20100038236A1 (en) * | 2008-08-18 | 2010-02-18 | Alex Rivera | Hydrogen-from-water on-demand supplemental vehicle fuel electrolyzer system |
US8062500B2 (en) | 2001-12-05 | 2011-11-22 | Oculus Innovative Sciences, Inc. | Method and apparatus for producing negative and positive oxidative reductive potential (ORP) water |
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